Hello everyone, since buying 21700 button top batteries such as Samsung 40T or 30T or Molicel P42A or Vapcell T42 on the market is increasingly difficult because they are not easy to find, I decided to make them at home using a 21mm MCPCB. that Simon Mao sells in his AliExpress shop at the following link: https://a.aliexpress.com/_uAX8yG
I will fix the PCB board on the flat top battery head with a transparent shrink film, taking care to leave the upper part uncovered that will touch the head of the flashlight.
Since I am not a technician I ask all BLF members if my idea could be a good one. Thank you.